Help with dualbooting Linux (EndeavourOS) needed

Hello everyone,
I wan to install a Linux distro on a second partition, in my case EndeavourOS which is sort of a preconfigured arch linux distribution. I tried to figure out method C first and installed EndevaourOS without a boot manager but I find the description on github a little bit confusing.
https://dortania.github.io/OpenCore-Multiboot/oc/linux.html#method-a-openlinuxboot

Now I want to try out method A where the first step is described as " Install Linux as you normally would". However I don't really like to create a second EFI partition and certainly don't want to override the existing one. So I'm not sure how to start.

Although this post might be a bit vague, maybe you could point me in the right direction and maybe clarify the article for me?

submitted by /u/leFelix
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